Preparation and characterization of superhard AlB2-type WB2 nanocomposite coatings
Preparation and characterization of superhard AlB2-type WB2 nanocomposite coatings
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DOI：
10.1002/pssa.201228828
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发表时间：
2013-06-01
影响因子：
2
通讯作者：
Sun, Chao
中科院分区：
文献类型：
--
作者：
Jiang, Chunlei;Pei, Zhiliang;Sun, Chao
采用直流磁控溅射法制备了WB2纳米复合涂层。对涂层的形貌、化学成分、化学结合状态、显微组织、硬度和摩擦学性能进行了研究。涂层呈柱状结构，致密均匀。X-射线衍射仪和高分辨电子显微镜进一步证实了沉积层具有亚稳态的AlB2型结构。通过纳米压痕获得的涂层具有43.2+/-5 GPa超硬度(取自平台区)。此外，在常温干滑动条件下，获得了稳态摩擦系数µ=0.23，磨损率K=6.5×10~(-6)mm_3N~(-1)·m~(-1)。这些特性表明，AlB2型WB2涂层作为超硬、低磨损涂层具有很大的应用潜力。此外，传统的粉末冶金技术在没有高压的情况下很难制备AlB2型WB2，本研究提出了一种新的实用制备方法。
WB2 nanocomposite coatings were synthesized by dc magnetron sputtering. The morphology, chemical composition, chemical bonding state, microstructure, hardness, and tribological properties were investigated. The columnar-structured coatings are dense and uniform. The as-deposited coatings were found to have a metastable AlB2-type structure as characterized by X-ray diffraction and further confirmed by high-resolution transmission electron microscopy. Coatings exhibit superhardness about 43.2 +/- 5GPa (taken from the plateau region) obtained by nanoindentation. In addition, the steady-state friction coefficient mu=0.23 and wear rate K=6.5x10-6mm3N-1m-1 were obtained under dry sliding condition in ambient environments. These characteristics indicate AlB2-type WB2 coatings have high potential application as superhard and low wear coatings. Moreover, the AlB2-type WB2 can hardly be prepared using the conventional powder metallurgy technology without high pressure, and this study proposes a new practical approach to prepare it.